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WO1998058089A1 - Procede de fusion de metal noble - Google Patents

Procede de fusion de metal noble Download PDF

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Publication number
WO1998058089A1
WO1998058089A1 PCT/JP1998/002479 JP9802479W WO9858089A1 WO 1998058089 A1 WO1998058089 A1 WO 1998058089A1 JP 9802479 W JP9802479 W JP 9802479W WO 9858089 A1 WO9858089 A1 WO 9858089A1
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WO
WIPO (PCT)
Prior art keywords
leaching
gold
silver
solution
leachate
Prior art date
Application number
PCT/JP1998/002479
Other languages
English (en)
Japanese (ja)
Inventor
Satoshi Okada
Hiromi Mochida
Original Assignee
Mitsubishi Materials Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corporation filed Critical Mitsubishi Materials Corporation
Priority to JP50411899A priority Critical patent/JP3879126B2/ja
Priority to US09/180,272 priority patent/US6126720A/en
Priority to DE19880534T priority patent/DE19880534C2/de
Publication of WO1998058089A1 publication Critical patent/WO1998058089A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/04—Obtaining noble metals by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for producing a noble metal, wherein silver is obtained by efficiently treating crude silver obtained from electrolytic slime of copper or lead or a dry process to recover refined silver, and preferably recovers gold in parallel with the purification of silver. . ⁇ Scenery
  • Copper and lead electrolytic slimes contain significant amounts of silver and gold, which have been recovered.
  • the method of electrowinning is to perform silver electrolysis using copper / lead electrolysis slime or crude silver obtained by dry smelting as an anode, and to collect purified silver, while using the anode slime generated in this silver electrolysis. It is known to dissolve impurities in nitric acid to remove impurities, deposit the remaining gold without dissolving into an anode, and perform gold electrolysis to obtain refined gold.
  • the copper 'lead electrowinning slime was leached with hydrochloric acid containing Sani ⁇ , the leachate by introducing S_ ⁇ 2 gas was reduced gold, method of deposition are known. In this reduction method, about 80% of the gold in the liquid is reduced, and the remaining unreduced gold is returned to the previous process and reduced again.
  • a method of reducing the gold in the leaching solution in S_ ⁇ 2 gas quality by suppressing the reduction rate of the gold to about 8 0% in order to be included in a large amount such as platinum and Palladium ⁇ beam is in (I) leachate should be kept, the remaining approximately 20% must be repeatedly processed, the processing efficiency is low, (ti) S_ ⁇ a control of 2 gas subtle, conditions change the gold grade of such greatly reduced There's a problem.
  • conventional methods for obtaining reduced silver via ammonia leaching include the following: (a) slime containing a large amount of impurities such as lead increases the cost of removing lead and the like; and (ii) process power from ammonia leaching to reduction. There is a problem that the amount of impurities of copper and lead is large although it is complicated.
  • the present invention solves such a problem in the conventional processing method, and easily purifies coarse silver by a relatively simple processing step, and furthermore, performs silver purification processing and gold recovery processing in parallel.
  • the purpose of the present invention is to provide a method for producing a precious metal, which can shorten the production period. Disclosure of the invention
  • the present invention solves the conventional problem of using an anode by dissolving coarse silver in nitric acid and electrolytically extracting silver using the leaching purified liquid as an electrolytic solution, instead of producing coarse silver into an anode for electrolytic refining. Resolved.
  • the leachate purification method and post-electrolysis solution treatment were improved to effectively eliminate impurities.
  • gold can be recovered in a short period of production. .
  • the present invention comprises: (1) a leaching step of dissolving coarse silver in nitric acid, a purification step of precipitating and removing impurity metals in the leachate, an electrolysis step of electrolyzing the purified liquid to precipitate and extract silver, and a post-electrolysis solution.
  • the present invention relates to a method for producing a noble metal, characterized in that nitric acid is recovered by removing the precipitate by reversing the process, and then recycled.
  • the production method of the present invention comprises the following steps: (2) in a coarse silver leaching step (primary leaching), an oxidizing agent is added to the leaching solution to precipitate a platinum group element in the solution; Including the method of sending to the liquid purification process.
  • potassium permanganate is used as an oxidizing agent, and potassium permanganate is used in an amount of 6 to 24 mol times the amount of platinum in the leachate, and 4 to 16 times the amount of palladium.
  • a method of adding the total amount of the above molar amount to precipitate and remove the platinum group element is included.
  • a permanganic acid rim is added to the primary leaching solution to precipitate the platinum group elements in the solution, thereby separating the platinum group element from the primary leaching solution. Can reduce the burden of purification processes.
  • an iron sulfide compound is added to a nitric acid leaching solution (primary leaching solution), and selenium in the solution under a liquidity of pH less than 3 to 4; Includes a method of precipitating tellurium and / or bismuth together with iron hydroxide, and further removing copper from the liquid by converting it to hydroxide under a pH of 4-5.
  • the production method of the present invention preferably has a gold recovery treatment system in parallel with the coarse silver purification treatment system.
  • the present invention provides (5) a silver treatment step of electrowinning silver by any one of the above methods (i) to (4), and, in parallel with this, a primary leaching slag of coarse silver (a chlorinated solution of a nitric acid residue).
  • the gold recovery step in the above-described production method of the present invention is, for example, (6) extracting gold from the secondary leachate by solvent extraction.
  • this gold reduction treatment system is as follows: (8) In the gold recovery step, secondary leaching is performed using hydrochloric acid containing oxalic acid and sodium chloride, and further, hydrogen peroxide and hydrochloric acid, chlorine gas and hydrochloric acid, or In this method, tertiary leaching is performed using hypochlorous acid and gold is reduced and precipitated by adding oxalic acid to the tertiary leaching solution.
  • FIG. 1 is a flow chart showing an outline of the production method of the present invention
  • FIG. 2 is a flow chart showing a step of reduction precipitation in the gold recovery process of the present invention.
  • the production method of the present invention has a processing system for electrolytically refining coarse silver and a gold recovery processing system in parallel. Each processing step will be described below.
  • the production method of the present invention comprises a leaching step of dissolving coarse silver in nitric acid (primary leaching), a purification step of removing precipitate metal in the leachate by precipitation, an electrolytic step of electrolyzing the purified liquid to extract and collect silver, It has a coarse silver electrolytic refining treatment system consisting of a step of circulating the solution after electrolysis to the leaching step.
  • coarse silver copper electrolytic slime (coarse silver obtained from lead angle slime, or coarse silver obtained from dry manufacturing) can be used.
  • the process for producing coarse silver is not limited.
  • coarse silver obtained by pressure leaching copper'lead electrolytic slime with sulfuric acid, ammonia leaching the residue generated when chlorinating the leachate, and reducing silver ammonium complex in the solution can be used. . (Leaching process)
  • the coarse silver is dissolved using nitric acid.
  • Coarse silver is easily dissolved in nitric acid by being shot into particles with a particle size of about 5 mm to form a silver nitrate solution.
  • nitric acid By dissolving nitric acid in nitric acid at a concentration of about 1N, silver can be easily dissolved, and it can be used as an electrolytic solution as it is after being purified.
  • transportation can be automated by making coarse silver into shots.
  • the process can be omitted and automation can be easily performed, and the entire electro-angle treatment process including the removal of the electro-angle and slime can be automated.
  • nitric acid leaching step By performing this nitric acid leaching step at a temperature of 680 ° C., a substantial amount of silver can be dissolved in a short time, for example, in about 2 hours when a sufficient amount of nitric acid is used for coarse silver. You can power. This nitric acid leaching solution is sent to about Ml.
  • the leachate is permeated with permanganate-powered lime and subjected to solid-liquid separation, whereby a primary leachate from which the platinum group elements have been removed in advance can be obtained.
  • Most of the platinum group elements such as platinum and palladium contained in the nitric acid leaching solution form nitrite complex ions and are converted into the nitric acid leaching solution.
  • potassium permanganate platinum and palladium are converted to hydroxides and precipitated.
  • other common oxidizing agent such as hydrogen peroxide, is used instead of permanganate reactor, the separation of platinum chloride, not the juice, is insufficient.
  • the added amount of permanganate power rim may be an amount sufficient to convert nitrite complex ions to nitrate ions. Specifically, it is preferably 14 mole times the amount required for oxidation.
  • Nitrite complex ion of platinum and palladium [P t (NO,) JP d (N0 2 ) J 2 -is composed of 6 molecules and 4 molecules of nitrite ion per atom of platinum and palladium, respectively.
  • a minimum of 6 moles of platinum and 4 moles of palladium are required, and preferably 14 moles of potassium permanganate, that is, The amount of potassium permanganate used is 642 times the amount of platinum in the solution, and 4 16 times the amount of palladium in the solution.
  • the total amount of the above molar amounts refers to, for example, when X mole of platinum and Y mole of palladium are present in the solution, permanganate power is 6 X moles to oxidize the nitrite complex ion of platinum, and Since 4 Y moles are each required to oxidize the nitrate complex ion, the total amount is 1 to 4 mole times the (6X + 4Y) of the addition of these. If the added amount of permanganate power is less than the above molar amount, the precipitation of platinum and palladium becomes sufficient. If the amount of potassium permanganate added exceeds the above molar amount, the permanganate ionic force S in the solution increases, and the potassium concentration also increases, which is not preferable.
  • the addition of permanganate power reamer is performed by adjusting the pH of the nitric acid leachate to 1 or more.
  • the pH of the nitric acid leaching solution By setting the pH of the nitric acid leaching solution to 1 or more, platinum or palladium liberated by the nitrite complex becomes a compound and precipitates.
  • the pH is 2 or higher, and more preferably, the pH is 2.5 or higher. However, if the pH exceeds 5, silver in the liquid becomes silver oxide, which is not suitable.
  • the liquid temperature is preferably at least 80 ° C.
  • the liquid temperature may be 60 to 80 ° C as described above.
  • platinum precipitation does not occur sufficiently at a solution temperature of 60 ° C or less.
  • lime quick lime, slaked lime
  • nitric acid leachate adjust pH in two stages and coprecipitate with iron.
  • lime is added to the nitric acid leaching solution to neutralize the solution, and the pH of the solution is adjusted to pH 3 to 4, preferably around pH 3.5. While adding iron sulfate, selenium, tellurium, bismuth, etc.
  • the pH of the leaching solution should be adjusted to 4 to 6, preferably 4 to 5, for palladium in the solution.
  • the pH of the leaching solution should be adjusted to 4 to 6, preferably 4 to 5, for palladium in the solution.
  • the pH of the nitric acid solution from which impurities have been removed in the above purification process is adjusted to obtain an electrolytic solution, and electrolysis is performed to precipitate and collect silver in the solution.
  • the pH of the electrolyte is 0.8 to 1.5 force.
  • Metallic silver deposited by electrolysis accumulates at the bottom of the tank.
  • the force sword material is a stainless steel plate
  • the anode material is a pure titanium plate or a titanium plate coated with ruthenium oxide.
  • the electrolyte has a temperature of 37 to 42 ° C and a current density of about 400 A / m 2 .
  • Crude silver with a purity of about 90-92% is refined to a purity of 9.99% by electrowinning.
  • sulfuric acid is added to the solution after electrolysis to adjust the liquid properties.
  • sulfuric acid is added to the solution after electrolysis, and calcium in the solution is converted to gypsum and precipitated to recover nitric acid.Lead in the solution is converted to lead sulfate and co-precipitated with gypsum, and this is filtered.
  • the nitric acid solution is circulated to the leaching step. In this way, the nitric acid is circulated after being recovered, so that it can be effectively reused in the leaching process.
  • the lead in the liquid is removed, the accumulation of lead is extremely small even if it is repeatedly used.
  • the sulfate contained in the circulated nitric acid solution has the effect that lead, which is an impurity contained in the coarse silver, becomes lead sulfate during the nitric acid leaching, and is precipitated and removed in the leaching step.
  • the production method of the present invention has a gold extraction treatment system together with the above-mentioned silver purification treatment system.
  • the method includes a step of electrowinning silver by the above electrolytic treatment method, and collecting gold after chlorinating and dissolving (secondary leaching) a residue generated by dissolving coarse silver in nitric acid (primary leaching).
  • the residue generated by dissolving the crude silver in nitric acid is dissolved in the presence of chlorine or hydrogen peroxide or dissolved in hypochlorous acid.
  • the primary leaching residue can be easily chlorinated and dissolved by chlorination using these chlorine and hydrogen peroxide together.
  • the reaction temperature is suitably from 60 to 75 ° C, and the acid concentration of the solution is suitably from 2 to 3N.
  • gold contained gold chloride Au u C 1 4 -
  • the gold extraction solvent is added to the hydrochloric acid solution obtained by leaching gold by the above-mentioned mouth ligation to extract gold.
  • a gold extraction solvent dibutyl carbitol or the like can be used.
  • the extraction conditions should be such that the acid concentration of the solution is 1 to 3N, and the volume ratio of the extraction solvent to the solution is 0.5 to 1.
  • hydrochloric acid is added to the solvent to wash impurities in the solvent, and then a reducing agent is added to the organic solvent in which gold is dissolved to selectively reduce gold and precipitate. Let it. Oxalic acid is suitable as the reducing agent.
  • gold can be recovered by reduction precipitation from the leachate.
  • Fig. 2 shows the gold recovery process by this reduction precipitation.
  • the primary leaching residue contains a platinum group element such as platinum or palladium by performing an oxidation treatment with a permanganic acid rim during the primary leaching, the primary leaching residue is chlorinated and dissolved in the presence of oxalic acid ( (Secondary leaching), and the platinum and / or palladium is leached to separate from the gold contained in the leaching residue.
  • a platinum group element such as platinum or palladium
  • This secondary leaching (the chlorinated solution is performed in the presence of a small amount of oxalic acid at an acid concentration in the range of 0.1 to 1 normal.
  • a donkey can be used as a source of chlorine ions. If chlorine ions are required in excess of this, it is advisable to add a neutral salt such as sodium chloride together with hydrochloric acid, etc. If the acid concentration is less than 0.1N, the leaching capacity of the platinum group element is sufficient. If it exceeds, the effect of oxalic acid to suppress gold leaching is small, and the amount of gold leached coexisting with platinum or palladium is not large, which is not preferable.
  • the reason for using a small amount of oxalic acid is to suppress the leaching of gold.
  • the amount of oxalic acid at this time may be an amount necessary to reduce the total amount of gold contained in the treated slag.
  • the reaction of this leaching process ⁇ is 75-901: 1 3 ⁇ 4.
  • the end point of the reaction can be known by confirming that the redox potential of the solution has fallen below the reduction potential of gold.
  • Platinum group elements such as platinum and palladium contained in the treated slag are chlorinated and dissolved in the secondary leachate.
  • gold remains in the leaching residue and can separate gold and platinum group elements.
  • Platinum and palladium in the leachate are recovered by precipitation with 7K oxide by neutralization with caustic soda, etc. or with ammonium chloride in combination, or by platinum / palladium extraction by solvent extraction I can do it.
  • the molten slag generated in the secondary leaching step is further chlorinated and dissolved (tertiary leaching) to leach gold.
  • This chlorination dissolution can be performed in the same manner as in the secondary leaching of the solvent extraction treatment. That is, it is better to use a combination of hydrogen peroxide and hydrochloric acid, or a combination of chlorine gas and hydrochloric acid, or hypochlorous acid. Dissolution of hydrochloric acid in the presence of hydrogen peroxide or chlorine gas can promote gold leaching.
  • the reaction temperature is suitably 60 to 80 ° C, and the acid concentration of the solution is suitably 2 to 11N.
  • the gold is included gold chloride - keep a amount necessary to, and the acid concentration in the liquid to 2 to 1 N (A n C 1 4) It is advisable to use the required amount of hydrochloric acid and 1.2 equivalents of hydrogen peroxide required to oxidize gold.
  • the end point of the reaction can be determined by confirming that the redox potential of the solution has exceeded the dissolution potential of gold.
  • Dissolved liquid obtained by the above chlorination and dissolution of molten slag Alkaline such as caustic soda is added to gold leaching, the liquid property is adjusted to around pH 1, and then a reducing agent is added to select gold in the liquid. If the pH of the solution is less than 0.5, the reduction rate of oxalic acid will be slowed, and the actual reduction rate will be reduced. If the pH is 2 or more, precipitation of impurities will occur. It is not preferable because it is generated and mixed with the reduced gold.
  • Oxalic acid is suitable as the reducing agent.
  • a reducing agent such as sodium sulfite or hydrazine, which is stronger than oxalic acid, is used, impurity metals such as platinum and palladium, which are dissolved in a small amount in the solution, are simultaneously reduced and precipitated, so that the purity of gold decreases.
  • Crude silver (grade: 5% gold, 92% silver, 2% copper, 0.15% palladium) 100 g leached with 1 liter of 1N nitric acid, 92 g / l silver, 2 copper A nitric acid solution of g / l, 10 ppm of palladium was obtained. Slaked lime was added to the solution to adjust the pH to 6, and copper and palladium hydroxides were precipitated and separated by filtration. The copper and palladium concentrations in the nitric acid solution after the purification were 1.5 g / l and 2 O ppm, respectively.
  • nitric acid was added to the nitric acid leaching solution to adjust the pH to 1, thereby obtaining an electrolytic solution.
  • Electrolysis was performed at 40 OA / m 2 for 7 hours, and 50% by weight of the silver content was collected.
  • slaked lime was added intermittently to keep the pH of the solution at 1. As a result, 99.99% of precipitated silver was obtained at a current efficiency of 97%.
  • the filtrate after the purification treatment (the concentrations of copper, selenium, tellurium, and bismuth contained in the nitric acid leachate were Cu: 1.5 g / l, Se: 2 ppm, and Te: ⁇ 1 ppm Bi: 2 ppm, respectively).
  • a black-brown precipitate was formed.These were separated by filtration and the concentrations of each element in the filtrate were measured.Ag: 100 g / 1, Cu: 2 g / 1, Pt: ⁇ 1 ppm, Pd: ⁇ lppm Thus, a primary leachate was obtained in which gold, palladium and palladium were separated. Further, when the precipitate was analyzed by X-ray diffraction, it was found that palladium hydroxide and platinum hydroxide were included, and the platinum content of palladium was 0.0175 g and 0.002 g, respectively.
  • potassium permanganate was added to 50 ml of the primary leachate in 0.8 ml. g was added (KMn04: 4 moles: 1 mole times the total moles of nitrite ions coordinated to Pt and Pd), and the mixture was sprinkled at 80 ° C for 1 hour and half.
  • Example 7 Except that 0.8 g of potassium permanganate (1 ⁇ 4 relative to the total molar amount of nitrite ion coordinated to Pt and Pd: 4 molar times) was used for 50 ml of the nitric acid solution of Example 4. In the same manner as in Example 4, permanganic acid-containing lime was added, and the formed precipitate was separated by filtration. When the concentration of each element in the filtrate was measured, it was found that Ag: 400 g / I, Cu: 8 g / KPt: ⁇ 1 ppm, and Pd: ⁇ lppm. The contents of platinum and palladium in the precipitate were 0.0175 g and 0.002 g, respectively.
  • Example 7 Example 7
  • Hydrochloric acid solution prepared by adding 5 g of caustic soda to 100 ml of 0.5 N hydrochloric acid was added to 10 g of the primary leach residue of coarse silver (pH: 1), and 2 g of oxalic acid was added, followed by reaction at 80 ° C for 1 hour After leaching, the mixture was filtered. Table 1 shows the metal concentrations of the filtrate (secondary leachate) together with the primary leachate. In addition, 100 ml of 0.5 N hydrochloric acid was added to the primary leachate to adjust the pH to 1, and then the above oxalic acid was added to the filtrate.
  • Example 4 the same crude silver leachate as in Example 4 was used, but as shown in Table 4, the secondary leachate had a higher gold concentration and the tertiary leachate had a lower gold concentration than Example 4. Therefore, the amount of collected gold is small.
  • Example 5 The same procedure as in Example 4 was repeated except that 100 ml of 1N sulfuric acid was used as the dissolving solution, and the primary leach residue was secondarily leached and filtered. The metal concentration of this filtrate (secondary leaching was shown in Table 5. Further, this filter cake was chlorinated and dissolved in the same manner as in Example 4. This leaching solution (the metal concentration of the third leaching swelling was compared with Table 5). Shown.
  • Example 5 the same crude silver leachate as in Example 4 was used, but as shown in Table 5, the platinum concentration and the palladium concentration in the secondary leachate were lower than those in Example 4, but the platinum in the tertiary leachate was lower. The concentrations of palladium and palladium were much higher, and the separation of platinum and palladium from gold was sufficient.
  • the production method of the present invention unlike the conventional treatment method, does not require a step of producing coarse silver on the anode during the electrolytic refining of coarse silver, and therefore can easily obtain high-purity silver. Wear. Further, when purifying the leachate, impurity metals such as selenium, tellurium, bismuth, copper, and lead can be effectively removed, so that slime having a large amount of impurities can be treated well.
  • the production method of the present invention has a gold extraction treatment system together with a silver electrolytic treatment system, so that gold can be recovered in parallel with silver purification, and the production time can be reduced. It can be greatly reduced. As an example, the manufacturing time can be reduced by about 20 days compared to the conventional manufacturing method in which gold is recovered after silver processing. In addition, since the manufacturing process is simple, it is possible to reduce the number of workers compared to narrow spaces.

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Abstract

Un procédé de fusion d'un métal noble consiste en un processus de traitement d'argent comprenant les étapes consistant à lixivier de l'argent brut avec de l'acide nitrique, à purifier le lixiviat, à électrolyser l'argent et à recycler le liquide après l'électrolyse. Dans l'étape de purification du lixiviat, ledit lixiviat est neutralisé par l'addition de chaux afin de précipiter et d'extraire les métaux impurs, tels que le séléniun, le tellurium, le bismuth et le cuivre. Dans l'étape de recyclage, on ajoute de l'acide sulfurique au liquide après l'électrolyse afin de précipiter et d'extraire la chaux et de rétablir l'acide nitrique afin de le réutiliser. De préférence, le processus de traitement de l'argent est exécuté simultanément avec l'étape de récupération d'or consistant à dissoudre les scories formées au cours de la lixiviation de l'argent brut avec de l'acide nitrique par chloration et récupération de l'or du lixiviat, par extraction au solvant ou précipitation réductive. Ce procédé facilite la préparation d'or et d'argent très purs en un temps de fusion de l'or nettement plus court que celui de la technique actuelle.
PCT/JP1998/002479 1997-06-16 1998-06-04 Procede de fusion de metal noble WO1998058089A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP50411899A JP3879126B2 (ja) 1997-06-16 1998-06-04 貴金属製錬方法
US09/180,272 US6126720A (en) 1997-06-16 1998-06-04 Method for smelting noble metal
DE19880534T DE19880534C2 (de) 1997-06-16 1998-06-04 Verfahren zum Reinigen von Edelmetall

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Application Number Priority Date Filing Date Title
JP9/158170 1997-06-16
JP15817097 1997-06-16

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WO1998058089A1 true WO1998058089A1 (fr) 1998-12-23

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DE (1) DE19880534C2 (fr)
WO (1) WO1998058089A1 (fr)

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JP4866732B2 (ja) * 2003-09-23 2012-02-01 オウトテック オサケイティオ ユルキネン 陽極汚泥の処理方法
JP2013540572A (ja) * 2010-08-20 2013-11-07 アドバンスド テクノロジー マテリアルズ，インコーポレイテッド 電気電子機器廃棄物から貴金属および卑金属金属を回収するための持続可能な方法
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JP2020132956A (ja) * 2019-02-20 2020-08-31 三菱マテリアル株式会社 金の回収方法
JP7146175B2 (ja) 2019-02-20 2022-10-04 三菱マテリアル株式会社 金の回収方法
JP2020193939A (ja) * 2019-05-30 2020-12-03 Ｄｏｗａテクノロジー株式会社 定量用試料の調製方法および塩化銀の製造方法
JP7624962B2 (ja) 2021-12-27 2025-01-31 中国科学院過程工程研究所 パラジウム抽出方法
CN115198096A (zh) * 2022-06-29 2022-10-18 江西铜业技术研究院有限公司 银阳极泥一段化学还原精炼制备四九金的方法

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